Smoot's Legacy

Smoot's Legacy

Smoot will return to MIT for the 50th anniversary of his famous pledge task on October 4. He won’t remeasure the bridge—or measure his ear—but the event includes a river cleanup and a ’50s bash. See web.mit.edu/smoot/ for details.

When Oliver Smoot ‘62 talks to prospective MIT students, he
likes to share a thing or two that he’s learned over the years. “One message,”
he says, “is you really have no way of knowing what long-term impact any hour
and a half’s worth of work is going to have.” He should know: as a freshman, he
spent about that much time measuring the Harvard Bridge,
using his body as a yardstick. What began as a pledge task for Lambda Chi Alpha
(LCA) in 1958 has become permanently etched, not only into the bridge, but into
MIT lore as well.

Smoot will return to MIT on October 4 to participate in a
Smoot 50th-­anniversary cele­bration for students and alumni. Although he won’t
be remeasuring the bridge, the festivities will include a Charles River
cleanup, a plaque installation on the bridge, and a 1950s-theme bash at the MIT Museum,
where Smoot will be presented with an official unit of measure: a Smoot stick.
Check event details at web.mit.edu/smoot/.

Anointing the Shortest Pledge

As Smoot tells it, Tom O’Connor ‘60, the LCA pledgemaster,
came up with the measurement idea. He was tired of making the half-mile trek
across the bridge to campus from LCA’s home in Boston without an inkling of how far he had
to go at any given point. O’Connor chose Smoot because he was, at
5’ 7”, the shortest pledge, thereby making the measurement more
labor-intensive. Plus, the name Smoot sounded scientific, like ampere or watt.

So on a crisp Thursday night in October, seven freshmen set
to work. They planned to calibrate the bridge with a few actual Smoot
lengths–having Smoot lie down and marking off the distance with chalk–and then
use a string to measure the rest of the bridge. But a sophomore LCA brother
happened by. He was so amused that he stayed to watch, so they had to abandon
the idea of using the string altogether.

They painted marks every 10 Smoots; by the end of the
bridge, Smoot was so exhausted he had to be carried along. But they finished
the job. According to their calculations, the bridge was 364.4 Smoots, plus or
minus an ear. They knew they couldn’t come up with a precise number, Smoot
explains, so they added the plus or minus, and wrote the e in ear as an
epsilon. “The epsilon referred in a cutesy way to this error measurement,” he
says. And therein lies another detail that has evolved over time: the epsilon
has been lost from written accounts of the story, Smoot says, and the minus
sign is often omitted as well.